The mob had only one rule: Never stop dancing.

Uncivil Unrest

Nontoken creatures you control have riot. (They enter with your choice of a +1/+1 counter or haste.)
If a creature you control with a +1/+1 counter on it would deal damage to a permanent or player, it deals double that damage instead.

Nontoken creatures you control have riot. (They enter the battlefield with your choice of a +1/+1 counter or haste.)
If a creature you control with a +1/+1 counter on it would deal damage to a permanent or player, it deals double that damage instead.

Secret Lair Drop

March of the Machine Commander

Nontoken creatures you control have riot.
If a creature you control with a +1/+1 counter on it would deal damage to a permanent or player, it deals double that damage instead.